/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2012 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "NewtonianPolynomial.H"
#include "addToRunTimeSelectionTable.H"
#include "surfaceFields.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace viscosityModels
{
    defineTypeNameAndDebug(NewtonianPolynomial, 0);
    addToRunTimeSelectionTable(viscosityModel, NewtonianPolynomial, dictionary);
}
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::viscosityModels::NewtonianPolynomial::NewtonianPolynomial
(
    const word& name,
    const dictionary& viscosityProperties,
    const volVectorField& U,
    const surfaceScalarField& phi
)
:
    viscosityModel(name, viscosityProperties, U, phi),
    nuB_("nuB", dimensionSet(0, 2, -1, 0, 0), viscosityProperties_.lookup("nuB")),
    Tb_("Tb", dimensionSet(0, 0, 0,  1, 0), viscosityProperties_.lookup("Tb")),
    Tc_("Tc", dimensionSet(0, 0, 0,  1, 0), viscosityProperties_.lookup("Tc")),
    nu_
    (
        IOobject
        (
            name,
            U_.time().timeName(),
            U_.db(),
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        U_.mesh(),
        nuB_
    )
{
    correct();
}


// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //

bool Foam::viscosityModels::NewtonianPolynomial::read
(
    const dictionary& viscosityProperties
)
{
    viscosityModel::read(viscosityProperties);

    viscosityProperties_.lookup("nuB") >> nuB_;
    viscosityProperties_.lookup("Tb") >> Tb_;
    viscosityProperties_.lookup("Tc") >> Tc_;
    
    correct();

    return true;
}

void Foam::viscosityModels::NewtonianPolynomial::correct()
{
    const volScalarField& T = nu_.db().lookupObject<volScalarField>("T");
    
    tmp<volScalarField> Ts = (T - Tb_)/(Tc_-Tb_);
    
    nu_ = nuB_*(Foam::exp(-3.2*Ts)+0.15);
}

// ************************************************************************* //
